Concentrating table



c. c. HERBERT 253515,374

Aug. 8,1944.

l CONCENTRATING TABLE Filed Deo. 16', 1942 .k-fZ.

7\ I 7\ 7N l Y 7 6 A 2. 5 5. 5 5 5 5 M M M l 15 14 1,5 z5

Lb' 14 41 5 f5 f 153 ,o 108 10 o 8 V9 ,5 ,49 14 9 8f 10 /f /5 M5" /5 12, l f

' Frcrl FIG. 2

INVENTOR- A Try MC A BY '67 Patented Aug. 8, 1944 iiruiian STATES rATENT OFFICE Charles C. Herbert, San Jose, Calif.

Application December 16, 1942, Serial No. 469,263

1 Claim.

The present invention relates particularly to the concentrating table used in placermining.

In placer mining there has always been a tendency for material flowing over the concentrating table to fill in the pockets between the several riiiles and thencontinue to flow on over the top of these filled pockets which have, of course, lost their efficiency.

It is one object of the present invention to provide means whereby the pockets between the several riiiies on a concentrating table may be prevented from losing their efficiency in the manner hereinbefore indicated.

It is also an object of the invention to provide means of the character indicated that will be economical in construction and application, simple in form and operation, and highly efficient in its practical application.

In the drawing:

Figure 1 is a side elevation of a portion of a concentrating table embodying my invention, partly in section.

Figure 2 is a sectional view on line 2-2, of Figure 1.

Referring now more particularly to the drawing, I show at I the sides of a concentrating table mounted as at 2 on a series of spaced and transversely disposed bottom members 3. Mounted upon the bottom of these members and extending lengthwise of the table are laterally spaced supporting bars 4. Between each two of the bottom members 3, and resting normally on the supporting bars 4, is a vertically slidable element 5. The several elements 5 are unattached and are of the same height as the members 3.

` Over the parts 3 and 5 and overlying the parts 3 and 5 the full length and width of the table is a flexible covering 6 held in place thereon by parts 2, and extending lengthwise of the members 3 on the upper side of covering 6 are the rililes 1.

Depending from the bottom surface of each alternate member 3, and midway the length thereof, is a bracket 8 supporting a pivot-pin 9 in parallel relation to member 3. On each pivotpin 9 is fulcrumed a lever I0, the several long arms of the levers being pivotally connected to an operating arm I I as at I2. The lever I0 branches and extends both ways from the fulcrum to form short arms as I3, and each short arm supports a rod I4 immediately below the adjacent slidable element 5 and in parallel relation therewith. The relative proportions of these parts are such that when the long arms I5 of the levers I3 are in a Vertical position relative to members 3 the rods I4 are inoperative, but when they are swung forwardly or backwardly the rods I4 are caused to push an element 5 upwardly.

'I'he members 3 are all of the same width and are equally spaced and the pivot-pins 9 are disposed below the centers of alternate members 3, so that each successive lever I0 when swung on its pivot-pin alternately pushes upwardly one of a pair of elements 5.

Since the ri'iiles l are mounted over the centers of members 3 and the members 3 are of equal size and equally spaced, it follows that the vertically slidable elements 5 are midway between the riiiies and when pushed upwardly as described they raise the overlying covering 6 as shown, first on one side of a member 3 and then on the other. Since the covering 6 is iiexible it readily falls back as the element 5 descends, and in this alternate rising and falling the material deposited between any two riiiies is constantly broken up and partially discharged therefrom so that additional material may enter.

The bar I I may be moved forwardly and backwardly as indicated by arrow I6 either at regular intervals or intermittently, and either manually or mechanically, and any suitable type of materials may be used. The essential feature of the invention is the imparting of a rising and falling movement to the floor between each two riffles to accomplish the purpose set forth, and to loosen or break up the material deposited therebetween so that particles of gold can work their way downwardly therethrough.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

A concentrating table of the character described comprising, a pair of spaced parallel side parts, uniformly spaced transversely disposed members of similar cross-sectional proportions associated iixedly therewith to form vertical guideways extending from one side to the other, vertically slidable elements disposed between said members in said guideways and extending substantially the length thereof, a flexible covering overlying said members and elements and supported thereby, means operative to support said elements in contact with said covering, riflies disposed over said covering in planes bisecting said members longitudinally and vertically, and means operative to slide said elements vertically in said guideways and effect displacement of material between said riliies.

CHARLES C. HERBERT. 

